﻿using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
using System.Text.RegularExpressions;

/// <summary>
/// myMysql 的摘要说明
/// </summary>
public class myMysql
{
    //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库. 
    // public static string connectionString = ConfigurationManager.ConnectionStrings["ConnDB"].ConnectionString; 
    // public static string connectionString = ConfigurationManager.AppSettings["MySQL"];
    public static string connectionString = "server=10.0.0.112;Port=3307;database=nga_special;uid=root;pwd=xxzx;charset=utf8";
    //public string m = ConfigurationManager.AppSettings["MySQL"]; 
    public myMysql() { }
    #region ExecuteNonQuery 
    //执行SQL语句，返回影响的记录数 
    /// <summary> 
    /// 执行SQL语句，返回影响的记录数 
    /// </summary> 
    /// <param name="SQLString">SQL语句</param> 
    /// <returns>影响的记录数</returns> 
    public static int ExecuteNonQuery(string SQLString)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (MySql.Data.MySqlClient.MySqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }
    /// <summary> 
    /// 执行SQL语句，返回影响的记录数 
    /// </summary> 
    /// <param name="SQLString">SQL语句</param> 
    /// <returns>影响的记录数</returns> 
    public static int ExecuteNonQuery(string SQLString, params MySqlParameter[] cmdParms)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            using (MySqlCommand cmd = new MySqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int rows = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    return rows;
                }
                catch (MySql.Data.MySqlClient.MySqlException e)
                {
                    throw e;
                }
            }
        }
    }
    //执行多条SQL语句，实现数据库事务。 
    /// <summary> 
    /// 执行多条SQL语句，实现数据库事务。 
    /// </summary> 
    /// <param name="SQLStringList">多条SQL语句</param> 
    public static bool ExecuteNoQueryTran(List<String> SQLStringList)
    {
        using (MySqlConnection conn = new MySqlConnection(connectionString))
        {
            conn.Open();
            MySqlCommand cmd = new MySqlCommand();
            cmd.Connection = conn;
            MySqlTransaction tx = conn.BeginTransaction();
            cmd.Transaction = tx;
            try
            {
                for (int n = 0; n < SQLStringList.Count; n++)
                {
                    string strsql = SQLStringList[n];
                    if (strsql.Trim().Length > 1)
                    {
                        cmd.CommandText = strsql;
                        PrepareCommand(cmd, conn, tx, strsql, null);
                        cmd.ExecuteNonQuery();
                    }
                }
                cmd.ExecuteNonQuery();
                tx.Commit();
                return true;
            }
            catch
            {
                tx.Rollback();
                return false;
            }
        }
    }
    #endregion
    #region ExecuteScalar 
    /// <summary> 
    /// 执行一条计算查询结果语句，返回查询结果（object）。 
    /// </summary> 
    /// <param name="SQLString">计算查询结果语句</param> 
    /// <returns>查询结果（object）</returns> 
    public static object ExecuteScalar(string SQLString)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
            {
                try
                {
                    connection.Open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (MySql.Data.MySqlClient.MySqlException e)
                {
                    connection.Close();
                    throw e;
                }
            }
        }
    }
    /// <summary> 
    /// 执行一条计算查询结果语句，返回查询结果（object）。 
    /// </summary> 
    /// <param name="SQLString">计算查询结果语句</param> 
    /// <returns>查询结果（object）</returns> 
    public static object ExecuteScalar(string SQLString, params MySqlParameter[] cmdParms)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            using (MySqlCommand cmd = new MySqlCommand())
            {
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    object obj = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (MySql.Data.MySqlClient.MySqlException e)
                {
                    throw e;
                }
            }
        }
    }
    #endregion
    #region ExecuteReader 
    /// <summary> 
    /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close ) 
    /// </summary> 
    /// <param name="strSQL">查询语句</param> 
    /// <returns>MySqlDataReader</returns> 
    public static MySqlDataReader ExecuteReader(string strSQL)
    {
        MySqlConnection connection = new MySqlConnection(connectionString);
        MySqlCommand cmd = new MySqlCommand(strSQL, connection);
        try
        {
            connection.Open();
            MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            return myReader;
        }
        catch (MySql.Data.MySqlClient.MySqlException e)
        {
            throw e;
        }
    }
    /// <summary> 
    /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close ) 
    /// </summary> 
    /// <param name="strSQL">查询语句</param> 
    /// <returns>MySqlDataReader</returns> 
    public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)
    {
        MySqlConnection connection = new MySqlConnection(connectionString);
        MySqlCommand cmd = new MySqlCommand();
        try
        {
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            cmd.Parameters.Clear();
            return myReader;
        }
        catch (MySql.Data.MySqlClient.MySqlException e)
        {
            throw e;
        }
        // finally 
        // { 
        // cmd.Dispose(); 
        // connection.Close(); 
        // } 
    }
    #endregion
    #region ExecuteDataTable 
    /// <summary> 
    /// 执行查询语句，返回DataTable 
    /// </summary> 
    /// <param name="SQLString">查询语句</param> 
    /// <returns>DataTable</returns> 
    public static DataTable ExecuteDataTable(string SQLString)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
                command.Fill(ds, "ds");
            }
            catch (MySql.Data.MySqlClient.MySqlException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds.Tables[0];
        }
    }
    /// <summary> 
    /// 执行查询语句，返回DataSet 
    /// </summary> 
    /// <param name="SQLString">查询语句</param> 
    /// <returns>DataTable</returns> 
    public static DataTable ExecuteDataTable(string SQLString, params MySqlParameter[] cmdParms)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            MySqlCommand cmd = new MySqlCommand();
            PrepareCommand(cmd, connection, null, SQLString, cmdParms);
            using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                try
                {
                    da.Fill(ds, "ds");
                    cmd.Parameters.Clear();
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }
        }
    }
    //获取起始页码和结束页码 
    public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord)
    {
        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            DataSet ds = new DataSet();
            try
            {
                connection.Open();
                MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection);
                command.Fill(ds, startResord, maxRecord, "ds");
            }
            catch (MySql.Data.MySqlClient.MySqlException ex)
            {
                throw new Exception(ex.Message);
            }
            return ds.Tables[0];
        }
    }
    #endregion
    /// <summary> 
    /// 获取分页数据 在不用存储过程情况下 
    /// </summary> 
    /// <param name="recordCount">总记录条数</param> 
    /// <param name="selectList">选择的列逗号隔开,支持top num</param> 
    /// <param name="tableName">表名字</param> 
    /// <param name="whereStr">条件字符 必须前加 and</param> 
    /// <param name="orderExpression">排序 例如 ID</param> 
    /// <param name="pageIdex">当前索引页</param> 
    /// <param name="pageSize">每页记录数</param> 
    /// <returns></returns> 
    public static DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize)
    {
        int rows = 0;
        DataTable dt = new DataTable();
        MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top 
        string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr);
        if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); }
        if (matchs.Count > 0) //含有top的时候 
        {
            DataTable dtTemp = ExecuteDataTable(sqlStr);
            rows = dtTemp.Rows.Count;
        }
        else //不含有top的时候 
        {
            string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr);
            //获取行数 
            object obj = ExecuteScalar(sqlCount);
            if (obj != null)
            {
                rows = Convert.ToInt32(obj);
            }
        }
        dt = ExecuteDataTable(sqlStr, (pageIdex - 1) * pageSize, pageSize);
        recordCount = rows;
        return dt;
    }
    #region 创建command 
    private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms)
    {
        if (conn.State != ConnectionState.Open)
            conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = cmdText;
        if (trans != null)
            cmd.Transaction = trans;
        cmd.CommandType = CommandType.Text;//cmdType; 
        if (cmdParms != null)
        {
            foreach (MySqlParameter parameter in cmdParms)
            {
                if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                (parameter.Value == null))
                {
                    parameter.Value = DBNull.Value;
                }
                cmd.Parameters.Add(parameter);
            }
        }
    }
    #endregion
}